{"id":"CVE-2026-47863","summary":"Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush","details":"In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.7.19 and earlier","modified":"2026-10-20T12:00:50.446317716Z","published":"2026-08-26T23:28:48.599Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"3.8.0"},{"last_affected":"3.8.6"},{"last_affected":"3.7.19"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"vmware","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47863.json"},"references":[{"type":"WEB","url":"https://spring.io/security/cve-2026-47863"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47863.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47863"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/reactor/reactor-core","events":[{"introduced":"0"},{"last_affected":"c84e170e12d78dc4c895d4b25bba2eb3a712e10d"}],"database_specific":{"extracted_events":[{"source":"DESCRIPTION","range":[{"introduced":"0"},{"last_affected":"3.7.19"}]}]}}],"versions":["v3.7.19","v3.7.18","v3.7.17","v3.7.16","v3.7.15","v3.7.14","v3.7.13","v3.7.12","v3.7.11","v3.7.10","v3.7.9","v3.7.8","v3.7.7","v3.7.6","v3.7.5","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0","v3.7.0-RC1","v3.7.0-M6","v3.7.0-M5","v3.7.0-M4","v3.7.0-M3","v3.7.0-M2","v3.7.0-M1","v3.6.4","v3.6.3","v3.6.2","v3.6.1","v3.6.0","v3.6.0-RC1","v3.6.0-M3","v3.6.0-M2","v3.6.0-M1","v3.5.7","v3.5.6","v3.5.5","v3.5.4","v3.5.3","v3.5.2","v3.5.1","v3.5.0","v3.5.0-RC1","v3.5.0-M6","v3.5.0-M5","v3.5.0-M4","v3.5.0-M3","v3.5.0-M2","v3.5.0-M1","v3.4.15","v3.4.14","v3.4.13","v3.4.12","v3.4.11","v3.4.10","v3.4.9","v3.4.8","v3.4.7","v3.4.6","v3.4.5","v3.4.4","v3.4.3","v3.4.2","v3.4.1","v3.4.0","v3.4.0-RC2","v3.4.0-RC1","v3.4.0-M2","v3.4.0-M1","v3.3.5.RELEASE","v3.3.4.RELEASE","v3.3.3.RELEASE","v3.3.2.RELEASE","v3.3.1.RELEASE","v3.3.0.RELEASE","v3.3.0.RC1","v3.3.0.M3","v3.3.0.M2","v3.3.0.M1","v3.2.6.RELEASE","v3.2.5.RELEASE","v3.2.4.RELEASE","v3.2.3.RELEASE","v3.2.2.RELEASE","v3.2.1.RELEASE","v3.2.0.RELEASE","v3.2.0.RC1","v3.2.0.M4","v3.2.0.M3","v3.2.0.M2","v3.1.4.RELEASE","v3.1.3.RELEASE","v3.1.2.RELEASE","v3.1.1.RELEASE","v3.1.0.RELEASE","v3.1.0.M2","v3.1.0.M1","v3.0.6.RELEASE","v3.0.5.RELEASE","v3.0.4.RELEASE","v3.0.3.RELEASE","v3.0.2.RELEASE","v3.0.1.RELEASE","v3.0.0.RELEASE","v3.0.0.RC2","v3.0.0.RC1","v2.5.0.M4","v2.5.0.M3","v2.5.0.M2","v2.5.0.M1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47863.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}